this is the "cbs overnight news." >> i'm don dahler. we have a lot more to tell you about this morning, starting with the dangers of vaping. more than three dozen deaths and 2,000 serious lung conditions have been traced to e-cigarettes, and many of them are linked to bootleg cartridges containing thc, the active ingredient in marijuana. well, it turns out it's not the thc making people sick, it's all that other stuff added to those carts. carter evans reports. >> reporter: this event that we're going to tonight just seems to be a group of vendors that have gathered together informally in one place so they can sell their vape cartridges.

this is the elicit market for thc vapor. to find out how dangerous and potentially deadly vape products end up on the streets, we brought hidden cameras to a warehouse 75 miles east of l.a. where marijuana's black market feels more like a house party. >> everybody having a good time? >> reporter: the thc oil inside these cartridges is unregulated. there is no way to know exactly what's in them and how it could hurt you. >> i have strawberry bubble gum. the dirty sprite's really popular. >> reporter: everyone claimed to have a pure product. >> no fillers. >> reporter: it's places like this wherepeople come to buy hundreds of vapes a at time sow they can resell them nationwide. >> here's what we've got. why would you buy these when you can buy a certified product in the store? well, it's price. these are a lot cheaper. these were about $20 apiece. you buy them in a store, it's

about $60 apiece there. >> has been so much coverage about the illegal market and no one has been covering the illicit market. >> reporter: he runs a site that provides reviews. a year and a half ago long before reports of deaths and illnesses across the country. he noticed something. people were getting sick. >> like they were getting headaches on this product and this product. >> reporter: many of the vape cartridges came from an underground scene like the one we went to. >> the current black market comes with a cartridge that has a brand, that has social media, that has websites, and it's really hard to distinguish between what is a legal cannabis product and what is an elicit product. >> reporter: that's becoming a big problem for art pushkin as he founded pure vape, a legal thc oil producer licensed in california. by law, his tamper-proof vapes include warning labels and lab results right on the package. are you worried that someone might try to copy your packaging

and sell a defective or dangerous product? >> very much so. >> reporter: he's already seen counterfeit pure vape products on the black market and warns customers. >> if they purchase from the stores that is not on the legal list we cannot guarantee if they're getting an authentic product. >> reporter: even if it says pure vape on the package? >> even if it says pure vape on the package, unfortunately. i know it's crazy, but that's the truth. >> reporter: we took our black market vapes to bell costa labs in long beach. byron rene is ceo. what's the worst thing you've ever found? >> i'd say predominantly in the underground market what we're seeing is a slew of pesticides. >> reporter: that was the case for the elicit vapes we picked up. they failed for a total of five pesticides, including one called myclobutanil. >> when you heat myclobutanil, you're getting hydrogen cyanide. >> cyanide? something you definitely don't want to inhale. >> no. >> reporter: what's the message

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light on harriet tubman, the hero of the underground railroad. mart martha tiesman goes underground. >> reporter: harriet tubman now on hold as andrew jackson's replacement for the $100 bill. what did you learn about her in school? that she ran away from slavery, and then risked her own freedom to free others. one sentence, two if that. >> harriet! >> playing her was tough and exhilarating. ♪ i'm sorry i'm going to leave you ♪ >> reporter: a new film starring cynthia arrivo. >> i made up my mind. i'm going back. >> reporter: is meant to flesh out the wikipedia entries. >> i saw her as a young woman a superhero buzz of that.hat was

>> reporter: the more you discover about harriet tubman, the more you realize she had to be a superhero. >> i'm going to be free in death. >> reporter: to pull off exploits, it would be an understatement to say were daring. >> these are the only known representations in a photograph that we have. >> reporter: kate clifford larson is tubman's biographer. >> this is 5 feet tall. this is a representation of tubman as a life-sized person. >> reporter: on the eastern shore of maryland, where she was born, the harriet tubman underground railroad visitor center opened in 2017. this tiny woman who could neither read nor write now has not one but two national parks dedicated to her story. >> would this have looked the way it did when harriet tubman was around here? >> yes. it would have looked exactly like this. >> reporter: she was born here, air minta ross, minty for short

around 1822. her parents were enslaved on different plantations. >> and that far farm on the other side of the river -- >> reporter: hours apart. >> minty's life as a slave was horrific. it was brutal. it was cruel. >> reporter: she and her mother were owned by edward broadus, who made $60 a year renting her out, starting when she was 6. >> she talked about how lonely and sad she was when she was separated from her mother and how she would cry herself to sleep at night. >> reporter: and then came the day when she was about 13 that she walked into the bucktown village store just as an overseer was trying to catch a runaway. >> when the overseer picked up one of these store weight, a two-pound weight. >> that's heavy. >> yes. and he threw it, intending to hit the young man who was fleeing, but tubman had stepped

back into the doorway and it slammed right into her skull. >> reporter: for the rest of her life, harriet tubman had sudden epileptic seizures and visions she said were from god. harriet was her mother's name. minty began calling herself that when she married john tubman. >> in 1849, she escaped from this place. >> reporter: right here? >> right here. >> reporter: a place called popular neck in caroline county, maryland. when word reached her that she was going to be sold south. just look at a map. imagine harriet tubman in her 20s running away alone, on foot. >> so she would have come to this home. >> reporter: she managed with the help of the underground railroad to make it 100 miles to the pennsylvania border and freedom. but then tubman went back 13

times over ten years. >> lord, help me cross. >> reporter: leading more than 70 people to freedom. this scene in the film, it really happened. and get this. during the civil war, she became the first american woman ever to lead troops into battle near buford, south carolina. >> they blew up the bridge. they liberated 750 enslaved people off the plantations along that river, and the newspapers at the time wrote about this raid, and they credited the raid to the black mosess. >> reporter: harriet tubman had an amazing ability to be at the center of history. her friends abolitionists

frederick douglass and john brown. tubman was a campaigner for women's suffrage alongside susan b. anthony. she spent the last 50 years of her remarkable life here in auburn, new york, where william henry seward, president abraham lincoln's secretary of state and his wife francis offered their friendship and support. >> she was a regular guest here. social visitor, welcomed here. so we're in the old house kitchen. >> reporter: jeff ludwig is education director at the seward house museum in auburn. >> it was known that harriet tubman was looking to place her family somewhere and to plant roots somewhere, to build a home for herself. and so they offer her a piece of land. >> reporter: seven acres. a black woman, technically a huge 5 slave buying a farm? unheard of. in 1869, she got married again to nelson davis, more than 20 years her junior. >> this is an amazing house.

it was one of nine cottages. >> reporter: in her 70s, she opened an old age home for formerly enslaved people and an infirmary providing free health care to anyone, black or white. >> she was a lightning rod for change. >> reporter: karen vivian hill heads the harriet tubman home. >> she was the serena williams of her time, okay. bold, bad, black, beautiful. >> reporter: we know she was deeply religious and that she had secret pleasures. >> strawberries were her favorite dessert. so we found strawberry seeds all over the property. >> reporter: so who was harriet tubman really? >> this is just tubman's scrapbook as my mother called it. >> reporter: to judith bryant, she was aunt harriet. >> i'm a great, great

grandniece. >> he and two other brothers she rescued from maryland in 1854. >> reporter: she's got bragging rights but chooses not to brag. >> it's my family. people always say oh, i didn't know you were related to harriet tubman. of course you didn't. but i did. we did. >> reporter: she invokes her famous relative when things go right. >> we have this expression, i do, that harriet's working overtime. she's sort of my guardian angel. >> reporter: tough and resolute to the very end, this was harriet tubman the year before she died in auburn on march 10th, 1913. she was 91, or thereabouts. her funeral was a major event. when you come here, how do you feel? >> proud. proud. >> reporter: harriet tubman's grave has become a destination, a shrine for visitors in need of

a but

for a lot of people, autumn is a time for apple picking with the kids and a trip through the local corn maze. well, if you have an entire afternoon, you may want to visit the largest corn maze in the world. mark strassmann did just that. >> reporter: they were lost, fifth graders zigzagging through a corn maze, thinking we've got to find a way out or this field trip could be our last. this illinois corn maze is rural sprawl. 28 acres in all, with almost ten miles of trails. >> we said if we're going to do it, why not be the world's largest? >> reporter: george richardson is a fifth generation family farmer. in 2001, they built their first corn maze and started telling people to get lost. >> they're in a wall of corn. that's the idea. it's extra dense from what a

regular corn field would be. >> reporter: most people hate getting lost. people here pay to get lost. why is that? >> myself included. well, we're paying for the challenge of solving the maze. they've got that map in front of them, and the challenge is finding the checkpoints. they know they're going to get found again. >> reporter: every year, a graphic designer creates an intricate schematic. planting starts in may. and when the crop is nine inches tall, a tractor tills the trails by gps. come september, corn nine feet tall towers over visitors. >> it can be disorienting. but that's part of the fun. >> reporter: several hundred feet up, you'll find something else. this maze honors the 50th anniversary of the apollo 11 moon landing. the theme changes every year. >> that great aerial photograph, we want people to go wow, that's a magnificent picture. our beatles maze in 2013, i mean you could see the faces of the

beatles. >> reporter: there are as many as 80,000 visitors a year. and here's a little maze secret. its design makes sure that all of them get out. three pedestrian bridges double as landmarks, and a series of checkpoints guides you around. so there are 24 of these? >> 24 checkpoints. we made it all the way to checkpoint number one. >> here, you want to squeeze it? >> reporter: we don't want people to get lost forever. >> that's bad for business? >> yeah. people stumbling around the next morning. so now we've gone to designing it with virtually no dead ends in the design. all the trarails loop around an connect with each other. >> reporter: our illinois fifth graders thought they'd need a search party, but they'll all make it back to johnsburg elementary school. >> i thought it was going to be very easy, but it turned out to be very hard. and i thought it was going to be my new home. >> reporter: sometimes you have to get lost to find the fun. mark strassmann, spring grove, illinois. >> that's the "overnight news" for this thursday.

from the cbs broadcast center in new york, i' don dahler. it's thursday, november 7th, 2019.